Commit | Line | Data |
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c029e147 L |
1 | AC_DEFUN([AC_COMPILE_CHECK_SIZEOF], |
2 | [changequote(<<, >>)dnl | |
3 | dnl The name to #define. | |
4 | define(<<AC_TYPE_NAME>>, translit(sizeof_$1, [a-z *], [A-Z_P]))dnl | |
5 | dnl The cache variable name. | |
6 | define(<<AC_CV_NAME>>, translit(ac_cv_sizeof_$1, [ *], [_p]))dnl | |
7 | changequote([, ])dnl | |
8 | AC_MSG_CHECKING(size of $1) | |
9 | AC_CACHE_VAL(AC_CV_NAME, | |
10 | [for ac_size in 4 8 1 2 16 12 $2 ; do # List sizes in rough order of prevalence. | |
11 | AC_TRY_COMPILE([#include "confdefs.h" | |
12 | #include <sys/types.h> | |
13 | $2 | |
14 | ], [switch (0) case 0: case (sizeof ($1) == $ac_size):;], AC_CV_NAME=$ac_size) | |
15 | if test x$AC_CV_NAME != x ; then break; fi | |
16 | done | |
17 | ]) | |
18 | if test x$AC_CV_NAME = x ; then | |
19 | AC_MSG_ERROR([cannot determine a size for $1]) | |
20 | fi | |
21 | AC_MSG_RESULT($AC_CV_NAME) | |
22 | AC_DEFINE_UNQUOTED(AC_TYPE_NAME, $AC_CV_NAME, [The number of bytes in type $1]) | |
23 | undefine([AC_TYPE_NAME])dnl | |
24 | undefine([AC_CV_NAME])dnl | |
25 | ]) | |
26 | ||
27 | AC_DEFUN([AC_C_BIGENDIAN_CROSS], | |
28 | [AC_CACHE_CHECK(whether byte ordering is bigendian, ac_cv_c_bigendian, | |
29 | [ac_cv_c_bigendian=unknown | |
30 | # See if sys/param.h defines the BYTE_ORDER macro. | |
31 | AC_TRY_COMPILE([#include <sys/types.h> | |
32 | #include <sys/param.h>], [ | |
33 | #if !BYTE_ORDER || !BIG_ENDIAN || !LITTLE_ENDIAN | |
34 | bogus endian macros | |
35 | #endif], [# It does; now see whether it defined to BIG_ENDIAN or not. | |
36 | AC_TRY_COMPILE([#include <sys/types.h> | |
37 | #include <sys/param.h>], [ | |
38 | #if BYTE_ORDER != BIG_ENDIAN | |
39 | not big endian | |
40 | #endif], ac_cv_c_bigendian=yes, ac_cv_c_bigendian=no)]) | |
41 | if test $ac_cv_c_bigendian = unknown; then | |
42 | AC_TRY_RUN([main () { | |
43 | /* Are we little or big endian? From Harbison&Steele. */ | |
44 | union | |
45 | { | |
46 | long l; | |
47 | char c[sizeof (long)]; | |
48 | } u; | |
49 | u.l = 1; | |
50 | exit (u.c[sizeof (long) - 1] == 1); | |
51 | }], ac_cv_c_bigendian=no, ac_cv_c_bigendian=yes, | |
52 | [ echo $ac_n "cross-compiling... " 2>&AC_FD_MSG ]) | |
53 | fi]) | |
54 | if test $ac_cv_c_bigendian = unknown; then | |
55 | AC_MSG_CHECKING(to probe for byte ordering) | |
56 | [ | |
57 | cat >conftest.c <<EOF | |
58 | short ascii_mm[] = { 0x4249, 0x4765, 0x6E44, 0x6961, 0x6E53, 0x7953, 0 }; | |
59 | short ascii_ii[] = { 0x694C, 0x5454, 0x656C, 0x6E45, 0x6944, 0x6E61, 0 }; | |
60 | void _ascii() { char* s = (char*) ascii_mm; s = (char*) ascii_ii; } | |
61 | short ebcdic_ii[] = { 0x89D3, 0xE3E3, 0x8593, 0x95C5, 0x89C4, 0x9581, 0 }; | |
62 | short ebcdic_mm[] = { 0xC2C9, 0xC785, 0x95C4, 0x8981, 0x95E2, 0xA8E2, 0 }; | |
63 | void _ebcdic() { char* s = (char*) ebcdic_mm; s = (char*) ebcdic_ii; } | |
64 | int main() { _ascii (); _ebcdic (); return 0; } | |
65 | EOF | |
66 | ] if test -f conftest.c ; then | |
9e07f89d | 67 | if ${CC-cc} ${CFLAGS} -c conftest.c -o conftest.o && test -f conftest.o ; then |
c029e147 L |
68 | if test `grep -l BIGenDianSyS conftest.o` ; then |
69 | echo $ac_n ' big endian probe OK, ' 1>&AC_FD_MSG | |
70 | ac_cv_c_bigendian=yes | |
71 | fi | |
72 | if test `grep -l LiTTleEnDian conftest.o` ; then | |
73 | echo $ac_n ' little endian probe OK, ' 1>&AC_FD_MSG | |
74 | if test $ac_cv_c_bigendian = yes ; then | |
75 | ac_cv_c_bigendian=unknown; | |
76 | else | |
77 | ac_cv_c_bigendian=no | |
78 | fi | |
79 | fi | |
80 | echo $ac_n 'guessing bigendian ... ' >&AC_FD_MSG | |
81 | fi | |
82 | fi | |
83 | AC_MSG_RESULT($ac_cv_c_bigendian) | |
84 | fi | |
85 | if test $ac_cv_c_bigendian = yes; then | |
86 | AC_DEFINE(WORDS_BIGENDIAN, 1, [whether byteorder is bigendian]) | |
87 | AC_DEFINE(HOST_WORDS_BIG_ENDIAN, 1, | |
88 | [Define if the host machine stores words of multi-word integers in | |
89 | big-endian order.]) | |
90 | BYTEORDER=4321 | |
91 | else | |
92 | BYTEORDER=1234 | |
93 | fi | |
94 | AC_DEFINE_UNQUOTED(BYTEORDER, $BYTEORDER, [1234 = LIL_ENDIAN, 4321 = BIGENDIAN]) | |
95 | if test $ac_cv_c_bigendian = unknown; then | |
9e07f89d | 96 | AC_MSG_ERROR([unknown endianess - sorry, please pre-set ac_cv_c_bigendian]) |
c029e147 L |
97 | fi |
98 | ]) |